PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM INSTRUMENT_HOST_NAME = "LUNAR PROSPECTOR" TARGET_NAME = MOON OBJECT = TEXT PUBLICATION_DATE = 2000-05-01 NOTE = "LUNAR PROSPECTOR LOSAPDR ARCHIVE" END_OBJECT = TEXT END LUNAR PROSPECTOR LOSAPDR ARCHIVE 1. Introduction This archive contains Lunar Prospector LOSAPDR (Line of Sight Acceleration Profile Data Record) products from both the nominal and extended part of the mission. It also contains documentation which describes the LOSAPDRs. Each LOSAPDR product contains the results from processing of radio tracking data of the Lunar Prospector spacecraft. There are 6628 LOSAPDRs in this archive. The entire LOS archive is comprised of 3 compact discs. LOS data from the nominal part of the mission is contained on 2 discs and data from the extended mission is on 1 disc. The table below lists the individual volumes (CDs) and their respective contents. VOLUME_ID Notes --------- -------------------------------------------------------- LP_1101 Nominal Mission LOS data (Jan. 13, 1998 - July 1, 1998) LP_1102 Nominal Mission LOS data (July 1, 1998 - Dec. 19, 1998) LP_1103 Extended Mission LOS data (Dec. 19, 1998 - July 30, 1999) LOSAPDR data products in this archive can be accessed electronically via the World Wide Web at: http://pds-geophys.wustl.edu/pds/lunar_prospector/los/ The archive will also be available at the National Space Sciences Data Center (NSSDC). The LOSAPDR products in this archive are the exact products released by the Lunar Prospector Project. Data, supporting documentation, and label files conform to the Planetary Data System (PDS) Standards, Version 3.0, Jet Propulsion Laboratory (JPL) document JPL D-7669. 2. File Formats Each orbit for which gravity data exists is represented by one LOSAPDR data file. The LOSAPDR is an ASCII file. The data file contains 3 tables: 1) HEADER_TABLE; 2) TIMES_TABLE; and 3) RESULTS_TABLE. The HEADER_TABLE is a single-row multi-column table containing information on initial values, control parameters, and simple calculations required by the program that generates the data files. The TIMES_TABLE is a single column containing exact times bounding spline intervals to the Doppler residuals. The number of rows is variable. The RESULTS_TABLE contains the results from spline fits to Doppler residuals. Each row in the table contains times, Doppler residuals, spacecraft position, and inferred spacecraft acceleration. The data files are described by detached PDS labels. Further information on LOSAPDR file formats and contents can also be obtained from the Lunar Prospector Software Interface Specification (SIS) document, a copy of which can be found in this archive as file LOSAPDR.TXT in the DOCUMENT directory. All document files and detached label files contain stream format records, with a carriage return character (ASCII 13) and a line feed character (ASCII 10) at the end of each line. This allows the files to be read by the MacOS, DOS, Unix, and VMS operating systems. All tabular files are also described by PDS detached labels. The detached PDS label file has the same name as the data file it describes, with the extension .LBL; for example, the file INDEX.TAB is accompanied by the detached label file INDEX.LBL in the same directory. Tabular files are formatted so that they may be read directly into many database management systems on various computers. All fields are separated by commas, and character fields are enclosed in double quotation marks ("). Character fields are left justified, and numeric fields are right justified. The "start byte" and "bytes" values listed in the labels do not include the commas between fields or the quotation marks surrounding character fields. The records are of fixed length, and the last two bytes of each record contain the ASCII carriage return and line feed characters. This allows a table to be treated as a fixed length record file on computers that support this file type and as a normal text file on other computers. Files in the EXTRAS directory are compressed in Zip format. Software to decompress Zip files is readily available from several sources. For more information see pds.jpl.nasa.gov. PDS labels are object-oriented. The object to which the label refers (e.g., IMAGE, TABLE, etc.) is denoted by a statement of the form: ^object = location in which the carat character (^, also called a pointer in this context) indicates that the object starts at the given location. In an embedded label, the location is an integer representing the starting record number of the object (the first record in the file is record 1). In a detached label, the location denotes the name of the file containing the object, along with the starting record or byte number. For example: ^TABLE = "INDEX.TAB" indicates that the TABLE object points to the file INDEX.TAB, in the same directory as the detached label file. Below is a list of the possible formats for the ^object keyword. ^object = n ^object = n ^object = "filename.ext" ^object = ("filename.ext",n) ^object = ("filename.ext",n) where n is the starting record or byte number of the object, counting from the beginning of the file (record 1, byte 1) indicates that the number given is in units of bytes filename is the upper-case file name ext is the upper-case file extension 3. Archive Contents Each archive volume is structured in one top-level directory with several subdirectories. The following diagram shows the structure and content of these directories. In the diagram, directory names are enclosed in square brackets ([]), upper-case letters indicate an actual directory or file name, and lower-case letters indicate the general form of a set of directory or file names. Not all directories are present on every disc; for example, only nominal mission data (NOMINAL directory) are included on the first 2 volumes (LP_1101 and LP_1102), and extended mission data (EXTENDED directory) only are on the third volume (LP_1103). FILE CONTENTS Top-level directory | |- AAREADME.TXT The file you are reading. | |- VOLDESC.CAT A description of the archive contents. | |- [CATALOG] A directory containing PDS catalog objects, | | and information about the LOSAPDR dataset. | | | |- CATINFO.TXT Description of files in the CATALOG | | directory. | | | |- MISSION.CAT A brief description of the mission. It | | includes a chronology of events, definition | | of mission phases, and science objectives. | | | |- INSTHOST.CAT A description of the Lunar Prospector spacecraft | | and an overview of the NASA Deep Space | | Network (DSN). | | | |- INST.CAT An overview of the spacecraft radio science | | system on Lunar Prospector and a summary | | description of the Deep Space Network | | instrumentation which supports radio science | | experiments. | | | |- DATASET.CAT PDS dataset catalog object. A description | | of the LOSAPDR dataset, parameters, | | processing, data coverage and quality. | | | |- REF.CAT A listing of references used elsewhere in | | the streamlined catalog files and of references | | that might be generally useful in working | | with these data. | | | |- PERSON.CAT A listing of key people involved in | generating and processing the archival dataset. | |- [EXTENDED] A directory containing LOSAPDR data files | | from the extended mission. | | | |- [LX_YYMM] Directories containing LOSAPDR data files, | | | where 'L' means Lunar Prospector, and 'X' denotes | | | the extended mission phase. 'YY' is a | | | two-digit year and can be 98 (for 1998) or | | | 99 (for 1999). 'MM' is is a two-digit month | | | of that year. | | | | | |- LXnnnnnJ.LOS LOSAPDR file for orbit number 'nnnnn'. Where 'L' | | | means Lunar Prospector, 'X' denotes the extended | | | mission phase; and 'J' is the target body gravity | | | field model identifier for all Lunar Prospector | | | mission orbits). | |- [NOMINAL] A directory containing LOSAPDR data files | | from the nominal mission. | | | |- [LN_YYMM] Directories containing LOSAPDR data files, | | | where 'L' means Lunar Prospector, and 'N' denotes | | | the nominal mission phase. 'YY' is a | | | two-digit year and can be 98 (for 1998) or | | | 99 (for 1999). 'MM' is is a two-digit month | | | of that year. | | | | | |- LNnnnnnJ.LOS LOSAPDR file for orbit number 'nnnnn'. Where 'L' | | | means Lunar Prospector, 'N' denotes the nominal | | | mission phase; and 'J' is the target body gravity | | | field model identifier for all Lunar Prospector | | | mission orbits). | |- [DOCUMENT] A directory containing document files | | relating to this archive. | | | |- DOCINFO.TXT Description of files in the DOCUMENT | | directory. | | | |- LOSAPDR.TXT The LOSAPDR SIS document describing the | format and content of the data files. | | |- [INDEX] A directory containing index files relating | | to this archive. | | | |- INDXINFO.TXT Description of files in the INDEX directory. | | | |- INDEX.LBL A PDS detached label describing INDEX.TAB. | | | |- INDEX.TAB Tabular summary of data files on this volume. | | | |- CUMINDEX.LBL A PDS detached label describing CUMINDEX.TAB. | | | |- CUMINDEX.TAB Tabular summary of data files on all volumes. | | |- [EXTRAS] A directory containing extra material that | may be of interest to users of the archive. | |- LOSRES_yymm.ZIP Zip-compressed files containing output from the LOSRES software used by the LP gravity team. 4. Whom to Contact for Information For questions concerning this archive, associated PDS labels and documentation: Jim Alexopoulos Washington University Dept. of Earth and Planetary Sciences 1 Brookings Drive Campus Box 1169 St. Louis, MO 63130 314-935-8152 Internet e-mail address: jim@wuzzy.wustl.edu For any questions concerning the LOSAPDR data products: Alex S. Konopliv Lunar Prospector Gravity Principal Investigator Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive MS 301-125J Pasadena, CA 91109 818-354-6105 Internet e-mail address: ask@krait.jpl.nasa.gov This archive was produced by Jim Alexopoulos.